TEODORA MALAERU, EROS ALEXANDRU PATROI, DELIA PATROI, EUGEN MANTA, VIRGIL MARINESCU, GABRIELA GEORGESCU INFLUENCE OF SYNTHESIS PARAMETERS OF FENI3 ALLOY NANOPARTICLES OBTAINED BY CHEMICAL REDUCTION METHOD IN AQUEOUS SOLUTION
This paper reports the synthesis of FeNi3 alloy nanoparticles by chemical reduction of the Fe2+ and Ni2+ ions, from the corresponding chlorides, with hydrazine (N2H4·H2O) as a reducing agent in aqueous solution at room temperature by modifying the molar ratio of the ions Fe2+: Ni2+, reaction time, with and without amine-type growth promoter, and reducing both, with or without ultrasonic aid. The FeNi3 alloy nanoparticles have been investigated by XRD, EDS spectrum analysis, SEM and VSM. When the molar ratio of Fe2+ and Ni2+ is equal to 1:3, reducing both, with or without ultrasonic aid, Fe2+ and Ni2+ were completely reduced into Fe and Ni, resulting FeNi3 alloy with a face-centered cubic (fcc) crystal structure. EDS analysis supported the presence of metal ions in atomic weight corresponding to the stoichiometric ratio of initial reaction. SEM analysis showed that nanoparticles of FeNi3 alloy have a spherical structural morphology. Hysteresis loop show a ferromagnetic behaviour of the FeNi3 alloy nanoparticles at room temperature.
Keywords: FeNi3 alloy, reduction method, magnetic properties, saturation magnetization